Regarding "These big Luton defenders".......... My observations are that Robbo isn't the biggest and is by no means a great headerer (if that's such a word) of the ball, therefore, the reason he had such a good game was that he was able to use his pace and anticipation of where / when to make his runs.
The bigger defenders (especially in the lower leagues), tend to be slower, so rather than fight fire with fire, Goodfellow would have been brought on, in the hope that he could do the "Roberts job", after running himself into the ground.
Obviously didn't work but that would be my guess.
